Sponge Filters
PPI Comparison
4.25" Replacement for Hydro (sponge only)
6" Replacement for Hydro (sponge only)
Hydro Foam Replacement
Hydro Sponge Filter
Old-time Sponge Filter Style
Replacement Sponge for old-time filters
Old-time Sponge Filter Style
Old-time Spong Filter Lift Tube

Filter - Replacement Foam

Regular price $2.50
Shipping calculated at checkout.

Made from our Pro-Level Reticulated Foam, specifically suited for colonizing nitrifying bacteria at the highest levels in your aquarium.

As you can see from the list below, a 4.25" cube contains a lot more foam than a 4" one - over 20% more!

  • 3" cube filter has a volume of 27 cubic inches
  • 3.25" cube filter has a volume of 34 cubic inches
  • 4" cube filter has a volume of 64 cubic inches
  • 4.25" cube filter has a volume of 77 cubic inches
  • 5" cube filter has a volume of 125 cubic inches

The Filter - Replacement Foam is one of our favorite items. We think you'll love it.

Inventory Last Updated: Dec 09, 2022

Customer Reviews

Based on 3 reviews
100%
(3)
0%
(0)
0%
(0)
0%
(0)
0%
(0)
J
Jason Reiss
Great buy

Excellent product

L
Leslie Hall
Great replacement foam

I use these in my 200 gallon outdoor goldfish pond as a prefilter on my waterfall pump. They go much longer than the original hydro sponges before they need cleaning. Highly recommend.

R
Rich German
Replacement sponges

I’ve used these sponges for about 20 years and they are the best you can buy.They last at least that long because I’m still using a couple of them yet. I’m so glad they’re made to fit the API filters so I don’t have to buy a whole new replacement